Staff at the Canadian embassy in Washington, D.C. are returning to work after the building was evacuated Friday morning following the discovery of a suspicious package.

United States Secret Service investigators gave the all-clear after inspecting the suspicious package.

The package was found in the mailroom Friday morning by embassy staff, who quickly called the United States Secret Service, said Ambassador Gary Doer.

"It was a postal packayge, I haven't gotten the full description yet, but it was safe at the end of the day. It was suspicious, they agreed it was suspicious when they looked at it and of course with the proper equipment they were able to determine it was safe. But having said that, when it came in it wasn't something you would normally get in the mail," Doer told CTV News Channel from Washington.

According to reports, an envelope containing a white substance was found within the building.

Earlier Friday, embassy spokesperson Chris Plunkett said the building was evacuated, and the 400 and 600 blocks of Pennsylvania Avenue were closed as a precaution.

Along with the Secret Service, fire fighters and members of the police bomb squad were on the scene, Doer said.